Two new alkaloids, picrasidines M (II) and P (III), have been isolated from the root-bark of Picrasma quassioides BENNET. The structure of picrasidine L has been revised from 3-methyl-canthin-2, 6-dione to 3-methylcanthin-5, 6-dione (I). The structures were determined on the basis of spectral analysis and chemical evidence.
从苦木(Picrasma quassioides BENNET)的根皮中分离出两种新的
生物碱——苦木碱M(II)和苦木碱P(III)。苦木碱L的结构已从3-甲基-坎亭-2,6-二酮修改为3-甲基坎亭-5,6-二酮(I)。这些结构是根据光谱分析和
化学证据确定的。